The prime 1366733339 can be peeled down to a single digit by removing one digit at a time from either end to make a sequence of primes 136673333, 36673333, 3667333, 667333, 66733, 6673, 673, 67, 7.

Determine the largest integer for which this is possible.

I have a bunch of pencils with the greatest left-truncatable prime.  I would presume the answer to the question above is even greater since you can use both ends of the number.

Posted by Jer on 2024-05-30 08:56:53